Add curl to Docker runtime image

[JulianKahnert]

Summary

• Adds curl package to the runtime Docker image to enable simplified healthcheck commands
• Allows replacing the complex bash /dev/tcp healthcheck with a simple curl -sf call

Test plan

• Verify Docker image builds successfully
• Verify curl is available inside the running container
• Verify healthcheck works with curl -sf -H 'Authorization: Bearer $AUTH_TOKEN' http://localhost:8080/health